I only play Left 4 dead, Left 4 Dead 2 & Counter Strike Source - all of which run pretty decent as it is. My one moan is some graphics lag when i have hordes of zombies biting at my ass on L4D2 lol! So i am in the hunt for something to cut this out. There is soooo many different ATI model numbers out at present i can't make sense of them. Some 4 series are better then 5 series etc etc and same with nVidia.
I have around the £100 mark to upgrade this with 20-30 extra for the right card. My PSU is a generic thing with 1x 6 pin PCI-E - nothing flash and didnt wanna upgrade unless i had to.
I've never even heard that brand... The HD4890 uses 2 6-pin power connectors. You could use an adapter but I would recommend the HD5770 instead. It's a bit slower than the HD4890 but it is newer, smaller, runs cooler, is DX11 compatible and has one power connector as it uses MUCH less power. It's also usually a decent amount cheaper.